Phenolic constituents and inhibitory effects of the leaf of Rauvolfia vomitoria Afzel on free radicals, cholinergic and monoaminergic enzymes in rat’s brain in vitro
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Olubukola H. Oyeniran
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Adedayo O. Ademiluyi
Abstract
Objectives
Rauvolfia vomitoria is a medicinal plant used traditionally in Africa in the management of several human diseases including psychosis. However, there is inadequate scientific information on the potency of the phenolic constituents of R. vomitoria leaf in the management of neurodegeneration. Therefore, this study characterized the phenolic constituents and investigated the effects of aqueous and methanolic extracts of R. vomitoria leaf on free radicals, Fe2+-induced lipid peroxidation, and critical enzymes linked to neurodegeneration in rat’s brain in vitro.
Methods
The polyphenols were evaluated by characterizing phenolic constituents using high-performance liquid chromatography coupled with diode array detector (HPLC-DAD). The antioxidant properties were assessed through the extracts ability to reduce Fe3+ to Fe2+; inhibit ABTS, DPPH, and OH radicals and Fe2+-induced lipid peroxidation. The effects of the extracts on AChE and MAO were also evaluated.
Results
The phenolic characterization of R. vomitoria leaf revealed that there were more flavonoids present. Both aqueous and methanolic extracts of R. vomitoria leaf had inhibitory effects with the methanolic extract having higher significant (p≤0.05) free radicals scavenging ability coupled with inhibition of monoamine oxidases. However, there was no significant (p≤0.05) difference obtained in the inhibition of lipid peroxidation and cholinesterases.
Conclusion
This study suggests that the rich phenolic constituents of R. vomitoria leaf might contribute to the observed antioxidative and neuroprotective effects. The methanolic extract was more potent than the aqueous extract; therefore, extraction of R. vomitoria leaf with methanol could offer better health-promoting effects in neurodegenerative condition.
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Research funding: None declared.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Competing interests: Authors state no conflict of interest.
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Ethical approval: This study was approved by the Animal Ethical Committee of the School of Science, Federal University of Technology, Akure, Nigeria, with approval number FUTA/SOS/2651, having followed all international and national guidelines for the care and use of laboratory animals.
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Articles in the same Issue
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- Climate change and declining fertility rate in Malaysia: the possible connexions
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- Phenolic constituents and inhibitory effects of the leaf of Rauvolfia vomitoria Afzel on free radicals, cholinergic and monoaminergic enzymes in rat’s brain in vitro
- Protective and curative role of vitamin D and hormones on the cadmium-induced inhibition of proliferation of human osteoblast cells
- The effect of bee pollen on reproductive and biochemical parameters in methotrexate-induced testicular damage in adult rats
- Histomorphometric study on effects of monosodium glutamate in liver tissue of Wistar rats
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Articles in the same Issue
- Frontmatter
- Reviews
- N-acetyl-cysteine as adjuvant therapy in female infertility: a systematic review and meta-analysis
- Climate change and declining fertility rate in Malaysia: the possible connexions
- Original Articles
- Potential anti-toxic effect of d-ribose-l-cysteine supplement on the reproductive functions of male rats administered cyclophosphamide
- Environmental and climatic impact on the infection and mortality of SARS-CoV-2 in Peru
- Prophylactic intravenous paracetamol use in extremely premature infants for patent ductus arteriosus
- Evaluation of heart rate variability, blood pressure and lipid profile alterations from dual transceiver mobile phone radiation exposure
- Strain specific response of mice to IMQ-induced psoriasis
- Curcumin exerts hepatoprotection via overexpression of Paraoxonase-1 and its regulatory genes in rats undergone bile duct ligation
- Zinc oxide nanoparticles with green tea extract complex in the pancreas of rats against monosodium glutamate toxicity
- Phenolic constituents and inhibitory effects of the leaf of Rauvolfia vomitoria Afzel on free radicals, cholinergic and monoaminergic enzymes in rat’s brain in vitro
- Protective and curative role of vitamin D and hormones on the cadmium-induced inhibition of proliferation of human osteoblast cells
- The effect of bee pollen on reproductive and biochemical parameters in methotrexate-induced testicular damage in adult rats
- Histomorphometric study on effects of monosodium glutamate in liver tissue of Wistar rats
- Diligent profiling of preclinical safety of the silk protein sericin
